United States Senate election in Maine, 1966

United States Senate elections, 1966

← 1964 November 8, 1966 1968 →
33 of the 100 seats in the United States Senate, plus 2 mid-term vacancies 51 seats needed for a majority
Majority party Minority party   Leader Mike Mansfield Everett Dirksen Party Democratic Republican Leader's seat Montana Illinois Last election 68 seats 32 seats Seats before 67 33 Seats won 64 36 Seat change 3 3 Popular vote 12,358,323 13,169,332 Percentage 47.9% 51.0% Swing 8.4% 8.8% Seats up 20 15
Republican hold   Republican gain   Democratic hold   Democratic gain
Majority Leader before election Mike Mansfield Democratic Elected Majority Leader Mike Mansfield Democratic

Mike Mansfield
Democratic

Mike Mansfield
Democratic

The United States Senate elections, 1966 was an election on November 8, 1966 for the United States Senate which occurred midway through the second (only full) term of President Lyndon B. Johnson. With divisions in the Democratic base over the Vietnam War, and with the traditional mid-term advantage of the party not holding the presidency, the Republicans took three Democratic seats. Despite Republican gains, the balance remained overwhelmingly in favor of the Democrats, who retained a 64–36 majority. This was also the first election that occurred after the Voting Rights Act of 1965 became law.

A bolded state name indicates an article about that state's election.